U.S. patent application number 15/204384 was filed with the patent office on 2016-11-03 for display device.
The applicant listed for this patent is Japan Display Inc. Invention is credited to Ryoichi ITO, Toshihiro Sato.
Application Number | 20160322435 15/204384 |
Document ID | / |
Family ID | 55455556 |
Filed Date | 2016-11-03 |
United States Patent
Application |
20160322435 |
Kind Code |
A1 |
ITO; Ryoichi ; et
al. |
November 3, 2016 |
DISPLAY DEVICE
Abstract
A display device includes an element substrate including a
display area where a plurality of self-light-emitting elements are
formed, and a driver IC disposed outside the display area in the
element substrate. A first metal layer is disposed on the reverse
side of the element substrate at a position opposite to the display
area. A second metal layer is disposed with a space between the
first metal layer and the second metal layer on the reverse side of
the element substrate at a position opposite to the driver IC.
Inventors: |
ITO; Ryoichi; (Tokyo,
JP) ; Sato; Toshihiro; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Japan Display Inc |
Tokyo |
|
JP |
|
|
Family ID: |
55455556 |
Appl. No.: |
15/204384 |
Filed: |
July 7, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14847923 |
Sep 8, 2015 |
9406731 |
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15204384 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
Y02E 10/549 20130101;
H01L 51/5253 20130101; H01L 2251/556 20130101; H01L 2251/301
20130101; H01L 27/32 20130101; H01L 51/0096 20130101; H01L 27/3244
20130101 |
International
Class: |
H01L 27/32 20060101
H01L027/32; H01L 51/52 20060101 H01L051/52; H01L 51/00 20060101
H01L051/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 17, 2014 |
JP |
2014-188588 |
Claims
1. A display device comprising: a plurality of organic emitting
elements; an element substrate which has a first surface including
a display region on which the plurality of organic elements are
arranged, the first surface including a peripheral region
surrounding the display region; a driver IC; and a thermal
dispersion film on a second surface of the element substrate, the
second surface being opposite to the first surface, wherein in plan
view, the element substrate has a rectangular shape and has a first
side, a second side, a third side facing the first side, and a
fourth side facing the second side, a first length of each of the
first and third sides is longer than a second length of each of the
second and fourth sides, the thermal dispersion film overlaps the
driver IC in plan view, the thermal dispersion film has a fifth
side and a sixth side in plan view, the fifth side faces the second
and fourth sides in plan view, and the sixth side faces the first
and third sides in plan view, and a third length of the fifth side
is shorter than the second length, and a fourth length of the sixth
side is shorter than the third length.
2. The display device according to claim 1, wherein the thermal
dispersion film is made of metal.
3. The display device according to claim 2, wherein the thermal
dispersion film is a copper film or an aluminum film.
4. The display device according to claim 1, wherein the driver IC
is arranged in the peripheral region in plan view.
5. The display device according to claim 1, further comprising a
counter substrate on the organic emitting elements, wherein the
counter substrate covers all areas of the display region and a part
of the thermal dispersion film in plan view.
6. The display device according to claim 1, further comprising a
protective layer including an insulating layer and covering the
thermal dispersion film and the second surface.
7. The display device according to claim 1, further comprising a
metal film on the second surface, wherein the display region
overlaps the metal film, and wherein a first plane size of the
metal film is larger than a second plane size of the thermal
dispersion film.
8. The display device according to claim 1, wherein the peripheral
region overlaps the thermal dispersion film in plan view.
9. The display device according to claim 1, wherein the thermal
dispersion film includes a first portion having the fifth and sixth
sides and a second portion, wherein the second portion has a
seventh side being parallel to the first side, and wherein the
sixth side is shorter than the seventh side.
10. A display device comprising: a plurality of organic emitting
elements; an element substrate which has a first surface including
a display region on which the plurality of organic elements are
arranged, the first surface including a peripheral region
surrounding the display region; a driver IC; and a thermal
dispersion film on a second surface of the element substrate, the
second surface being opposite to the first surface, wherein the
thermal dispersion film overlaps the driver IC in plan view, the
display region has an area which doesn't overlap the thermal
dispersion film in plan view.
11. The display device according to claim 10, wherein the thermal
dispersion film is made of metal.
12. The display device according to claim 11, wherein the thermal
dispersion film is a copper film or an aluminum film.
13. The display device according to claim 10, wherein the driver IC
is arranged in the peripheral region in plan view.
14. The display device according to claim 10, further comprising a
counter substrate on the organic emitting elements, wherein the
counter substrate covers all areas of the display region and a part
of the thermal dispersion film in plan view.
15. The display device according to claim 10, further comprising a
protective layer including an insulating layer and covering the
thermal dispersion film and the second surface.
16. The display device according to claim 10, further comprising a
metal film on the second surface, wherein the display region
overlaps the metal film, and wherein a first plane size of the
metal film is larger than a second plane size of the thermal
dispersion film.
17. The display device according to claim 10, wherein the
peripheral region overlaps the thermal dispersion film in plan
view.
18. The display device according to claim 10, wherein in plan view,
the element substrate has a rectangular shape and has a first side,
a second side, a third side facing the first side, and a fourth
side facing the second side, a first length of each of the first
and third sides is longer than a second length of each of the
second and fourth sides, wherein the thermal dispersion film
includes a first portion and a second portion, wherein the first
portion has a fifth side extending along the second or fourth side
and a sixth side facing the first or third side, wherein the second
portion has a seventh side extending along the first or third side
and an eighth side facing the second or fourth side, wherein the
sixth side is shorter than the seventh side.
19. A display device comprising: a plurality of organic emitting
elements; an element substrate has a first surface including a
display region on which the plurality of organic elements are
arranged, the first surface including a peripheral region
surrounding the display region; a driver IC; and a first film on a
second surface of the element substrate, the second surface being
opposite to the first surface, wherein in plan view, the element
substrate is a rectangular shape and has a first side, a second
side, a third side facing the first side, and a fourth side facing
the second side, a first length of each of the first and third
sides is longer than a second length of each of the second and
fourth sides, the first film overlaps the driver IC in plan view,
the first film has a fifth side and a sixth side in plan view, the
fifth side faces the second and fourth sides in plan view, and the
sixth side faces the first and third sides in plan view, and a
third length of the fifth side is shorter than the second length,
and a fourth length of the sixth side is shorter than the third
length.
20. The display device according to claim 19, wherein the first
film is made of metal.
21. The display device according to claim 20, wherein the first
film is a copper film or an aluminum film.
22. The display device according to claim 19, wherein the driver IC
is arranged in the peripheral region in plan view.
23. The display device according to claim 19, further comprising a
counter substrate on the organic emitting elements, wherein the
counter substrate covers all areas of the display region and a part
of the first film in plan view.
24. The display device according to claim 19, further comprising a
protective layer including an insulating layer and covering the
first film and the second surface.
25. The display device according to claim 19, further comprising a
metal film on the second surface, wherein the display region
overlaps the metal film, and wherein a first plane size of the
metal film is larger than a second plane size of the first
film.
26. The display device according to claim 19, wherein the
peripheral region overlaps the first film in plan view.
27. The display device according to claim 19, wherein the first
film includes a first portion having the fifth and sixth sides and
a second portion, wherein the second portion has a seventh side
being parallel to the first side, and wherein the sixth side is
shorter than the seventh side.
28. A display device comprising: a plurality of organic emitting
elements; an element substrate which has a first surface including
a display region on which the plurality of organic elements are
arranged, the first surface including a peripheral region
surrounding the display region; a driver IC; and a first film on a
second surface of the element substrate, the second surface being
opposite to the first surface, wherein the first film overlaps the
driver IC in plan view, the display region has an area which
doesn't overlap the first film in plan view.
29. The display device according to claim 28, wherein the first
film is made of metal.
30. The display device according to claim 29, wherein the first
film is a copper film or an aluminum film.
31. The display device according to claim 28, wherein the driver IC
is arranged in the peripheral region in plan view.
32. The display device according to claim 28, further comprising a
counter substrate on the organic emitting elements, wherein the
counter substrate covers all areas of the display region and a part
of the first film in plan view.
33. The display device according to claim 28, further comprising a
protective layer including an insulating layer and covering the
first film and the second surface.
34. The display device according to claim 28, further comprising a
metal film on the second surface, wherein the display region
overlaps the metal film, and wherein a first plane size of the
metal film is larger than a second plane size of the first
film.
35. The display device according to claim 28, wherein the
peripheral region overlaps the first film in plan view.
36. The display device according to claim 28, wherein in plan view,
the element substrate is a rectangular shape and has a first side,
a second side, a third side facing the first side, and a fourth
side facing the second side, a first length of each of the first
and third sides is longer than a second length of each of the
second and fourth sides, wherein the first film includes a first
portion and a second portion, wherein the first portion has a fifth
side extending along the second or fourth side and a sixth side
facing the first or third side, wherein the second portion has a
seventh side extending along the first or third side and an eighth
side facing the second or fourth side, wherein the sixth side is
shorter than the seventh side.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority from Japanese
application JP2014-188588 filed on Sep. 17, 2014, the content of
which is hereby incorporated by reference into this
application.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a display device.
[0004] 2. Description of he Related Art
[0005] As one of display devices including a self-light-emitting
element in a pixel circuit, an organic EL display device is
known.
[0006] In each of pixels of such an organic EL display device, a
self-light-emitting element configured to include an upper
electrode, a lower electrode, and an organic layer interposed
therebetween is disposed. In the organic layer, holes and electrons
injected from the upper electrode and the lower electrode,
respectively, are recombined together, so that light is
emitted.
[0007] JP 2010-114429 A discloses an organic EL display device in
which a heat equalizing means is provided on both the front and
reverse surfaces of a substrate.
SUMMARY OF THE INVENTION
[0008] When the self-light-emitting element described above is
maintained at a high temperature for a long time, the life of the
self-light-emitting element is shortened.
[0009] Here, outside a display area where a plurality of
self-light-emitting elements are arranged, a driver IC that
performs display control of each pixel in the display area is
disposed. The driver IC is a heat source during image display.
Therefore, the self-light-emitting elements arranged at a place
near the driver IC are likely to he exposed to a high-temperature
state, so that the deterioration of self-light-emitting elements
may progress at the place.
[0010] In view of the problem described above, it is an object of
the invention to provide a display device in which the progress of
deterioration of a self-light-emitting element in a display area
due to a high temperature is prevented.
[0011] (1) In view of the problem described above, a display device
according to an aspect of the invention includes: an element
substrate including a display area where a plurality of
self-light-emitting elements are formed; and a driver IC disposed
outside the display area in the element substrate, wherein a first
metal layer is disposed on the reverse side of a position serving
as the display area in the element substrate, and a second metal
layer is disposed with a space between the first metal layer and
the second metal layer on the reverse side of a position where the
driver IC is disposed in the element substrate.
[0012] (2) In (1), the first metal layer and the second metal layer
may be covered with a protective layer formed of an insulating
layer.
[0013] (3) In (1) and (2), the driver IC may be disposed in an area
exposed from a counter substrate that is disposed to face the
element substrate, and the second metal layer may be bent while
extending on the reverse side of the exposed area where the driver
IC is disposed, and extend on the reverse side of an area
overlapping the counter substrate and located outside the display
area where the plurality of self-light-emitting elements are
formed.
[0014] (4) In (1) to (3), the first metal layer and the second
metal layer may be divided by the space and each may be formed in
an island-shape.
[0015] (5) In (1) to (3), the first metal layer and the second
metal layer may be electrically connected by means of a bridge
portion composed of a metal layer, and the first metal layer and
the second metal layer may be maintained at the same potential
[0016] (6) In (1) to (5), the first metal layer and the second
metal layer may be metal layers stacked in the same process by
sputtering or vapor deposition.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a plan view schematically showing an organic EL
display device according to a first embodiment.
[0018] FIG. 2 is a plan view schematically showing the state of a
reverse surface of the organic EL display device in the first
embodiment.
[0019] FIG. 3 shows the state of a cross section at a predetermined
position in the organic EL display device in the first
embodiment.
[0020] FIG. 4 shows the state of a reverse surface of an organic EL
display device in a second embodiment.
[0021] FIG. 5 shows the state of a reverse surface of an organic EL
display device in a third embodiment.
DETAILED DESCRIPTION OF THE INVENTION
[0022] Hereinafter, organic EL display devices according to
embodiments of the invention will be described with reference to
the drawings.
First Embodiment
[0023] FIG. 1 is a schematic plan view for explaining an organic EL
display device 1 of a first embodiment. The organic EL display
device 1 of the embodiment is configured by bonding a counter
substrate B2 to an element substrate in which a plurality of
organic electroluminescent elements are disposed. In an area
(exposed area EX) exposed from the counter substrate B2 in the
element substrate E1, a driver IC 2 for driving the organic EL
display device 1 is disposed.
[0024] In a display area DP of the organic EL display device 1, a
plurality of pixels as objects of display control are arranged in a
matrix. In each of the pixels, the organic electroluminescent
element (self-light-emitting element) is disposed. As shown in FIG.
1, a first scanning line BG, a second scanning line SG, a reset
wire Vrst, and a video signal line Data are connected to each of
the pixels of the display area DP. The first scanning line BG, the
second scanning line SG, and the reset wire Vrst are laid so as to
be parallel to an X-direction, and the video signal line Data is
laid so as to be parallel to a Y-direction. Although omitted in
FIG. 1, a plurality of power supply lines that supply the
self-light-emitting elements with power are laid so as to be
parallel to the Y-direction.
[0025] The driver IC 2 in the embodiment is configured to include a
signal line driver circuit for outputting a video signal to each of
the video signal lines Data and a scanning line driver circuit for
outputting various signals to the first scanning line BC, the
second scanning line SG, and the reset wire Vrst. Wires are routed
from the driver IC through a picture-frame area FR located around
the periphery of the display area DP, to thereby supply the first
scanning line BG and the like with the signals. The scanning line
driver circuit or the video signal line driver circuit included in
the driver IC 2 may be configured as a peripheral circuit in the
picture-frame area FR.
[0026] The driver IC 2 is connected with, via bumps and an
anisotropic conductive film, a plurality of terminals formed in the
exposed area of the organic EL display device 1. Hence, the heat of
the driver IC 2 generated by the driving of the organic EL display
device 1 is transmitted to the plurality of terminals formed on the
element substrate B1 and to the surroundings of the terminals.
[0027] Here, especially FIG. 2 schematically shows the state of a
reverse surface of the organic EL display device 1 of the
embodiment. As shown in the drawing, a first metal layer M1 is
disposed in a position corresponding to the reverse surface of the
display area DP, and a second metal layer M2 is disposed in a
position corresponding to the reverse surface of the attached place
of the driver IC 2. That is, the first metal layer M1 and the
second metal layer M2 are disposed on a surface of the element
substrate El, which is composed of a glass substrate or the like,
opposite to a self-light-emitting element-forming surface.
[0028] In the embodiment, the first metal layer M1 is disposed so
as to entirely overlap the display area DP and further overlap the
picture-frame area FR located around the periphery of the display
area DP, whereby dissipation, dispersion, and equalization of heat
generated in the display area DP are facilitated. Similarly, the
second metal layer M2 is disposed so as to extend longer than the
driver IC 2 while overlapping the entire driver IC 2 (disposed so
as to extend longer than the length of the driver IC 2 in the
longitudinal direction thereof), whereby the reverse surface of the
exposed area EX is effectively utilized and thus the heat is
dissipated and equalized in an area wider than the area of the
driver IC 2.
[0029] Further, a space is present between the first metal layer M1
and the second metal layer M2, and the space substantially
corresponds to a position on the reverse surface of the boundary
between the counter substrate P2 and the exposed area EX. Since the
space is present between the first metal layer M1 and the second
metal layer M2, transmission of heat from the central place of the
driver IC 2 in which heat generation is large to he display area DP
is prevented, so that the influence on the life of the
self-light-emitting elements in the central place in a
dashed-dotted line frame R) of the edge portion of the display area
DP on the driver IC 2 side and in the vicinity of the central place
is suppressed.
[0030] FIG. 3 shows a cross-sectional view of the organic EL
display device 1 of the embodiment. The first metal layer M1 and
the second metal layer M2 of the embodiment are formed by stacking,
for example, metal having a high heat conductivity such as Al or Cu
by a method such as vapor deposition or sputtering using a rough
mask. Moreover, as shown in the drawing, the first metal layer M1
and the second metal layer M2 are covered with a protective layer
PA composed of an organic insulating film such as acrylic resin
(the protective layer PA is not shown in FIG. 2). Since the first
metal layer Mi and the second metal layer M2 are covered with the
protective layer PA, the peeling-off or breakage of the first metal
layer M1 and the like is prevented in the later process, and
further, it is possible to reduce an adverse effect in the later
process due to the generation of foreign substances caused by the
peeling-off or the like. Moreover, it is also possible to prevent
the corrosion of the first metal layer M1 and the like.
Second Embodiment
[0031] Next, a second embodiment of the invention will be
described. FIG. 4 schematically shows the state of a reverse
surface of an organic EL display device 1 of the second
embodiment.
[0032] As shown in the drawing, in the organic EL display device 1
of the second embodiment, a second metal layer M2 is bent, and
extends linearly on the reverse surface of a picture-frame area FR.
The picture-frame area FR in the embodiment is an area overlapping
a counter substrate 32 and surrounding the periphery of a display
area DP. The second metal layer M2 extends linearly, on the reverse
surface of an element substrate B1, so as to be along the periphery
of an area overlapping the display area DP.
[0033] In this manner, since the second metal layer M2 extends from
the reverse surface of the exposed area EX to the place overlapping
the counter substrate B2, the area of a heat conductive material is
widely secured. (the heat capacity of the heat conductive material
is increased), and thus the equalization of heat generated from the
driver IC 2 is further facilitated. Moreover, since a Portion of
the second metal layer M2 extending to overlap the counter
substrate B2 is also disposed with a space between the portion of
the second metal layer M2 and the first metal layer M1, the heat
generated in the driver IC 2 is prevented from transmitting to the
display area DP (the reverse surface thereof).
[0034] The organic EL display device 1 of the second embodiment
differs from the organic EL display device 1 of the first
embodiment in the points described above, but is configured
substantially similarly to the organic EL display device 1 of the
first embodiment except for the points. Therefore, the description
is appropriately omitted.
[0035] In the organic EL display device 1 of the second embodiment,
the second metal layer M2 is configured so as to extend at two
places on the reverse side of the picture-frame area FR. However,
the second metal layer M2 maybe configured so as to extend at one
place on the reverse side of the picture-frame area FR. Moreover,
the second metal layer M2 is configured so as to extend, starting
from an edge portion of the picture-frame area FR on the exposed
area EX side toward an edge portion on the other side, along the
display area DP.
Third Embodiment
[0036] Next, a third embodiment of the invention will be described.
FIG. 5 schematically shows the state of a reverse surface of an
organic EL display device 1 of the third embodiment. In the first
embodiment and the second embodiment, the two metal layers, the
first metal layer M1 and the second metal layer M2, are formed in
an island-like pattern in which the two metal layers are
independent of each other and not continuous with each other, and
thus separated from each other; whereas, the organic EL display
device 1 of the third embodiment differs from the first embodiment
and the second embodiment in that two metal layers are connected by
means of a bridge portion BR.
[0037] As shown in the drawing, in the organic EL display device 1
of the third embodiment, a second metal layer M2 and a first metal
layer M1 are connected via the bridge portion BR, whereby the two
metal layers are at the same potential to function as an
electrostatic barrier of an element substrate B1. The bridge
portion BR in the embodiment is composed of metal of the same kind
as the first metal layer M1 and the like. The first metal layer M1
and the like may be connected, via a contact hole, with a wiring
layer that provides a predetermined potential, and the wiring layer
may be provided with a predetermined potential from a flexible
printed board connected in the exposed area EX where the driver IC
2 is disposed.
[0038] Moreover, when the bridge portion BR is set as in the
embodiment, a contact point between the bridge portion BR and the
second metal layer M2 is desirably disposed so as to be separated
as far as possible from the driver IC 2. As shown in FIG. 5, the
longitudinal direction of the exposed area EX and the longitudinal
direction of the driver IC 2 are disposed so as to be substantially
parallel to each other; it is better for the bridge portion BR to
be formed avoiding an area between two longitudinal-direction ends
E1 and E2 of the driver IC 2 having a rectangular-shaped structure;
and a space between the first metal layer M1 and the second metal
layer M2 is desirably secured in the area between the
longitudinal-direction ends E1 and E2. Moreover, the bridge portion
BR may connect a portion of the second metal layer M2 extending in
the picture-frame area FR with the first metal layer M1.
[0039] Although, in the embodiments, the protective layer PA
composed of the organic insulating film and covering the first
metal layer M1 and the second metal layer M2 is formed, the
invention is not limited to such a form. The protective layer PA
may be formed of an inorganic insulating film (such as SiN.sub.x),
or the protective layer PA may not be formed.
[0040] Although the first metal layer M1 and the second metal layer
M2 are desirably formed simultaneously in the same process by a
method such as vapor deposition or sputtering as in the
embodiments, the invention is not limited to such a form. For
example, the first metal layer M1 and the second metal layer M2 may
be formed individually by attaching a metal thin film with an
adhesive.
[0041] Although the display device in each of the embodiments is
the organic EL display device 1, the invention is not limited to
this. For example, the display device may be a display device
including a self-light-emitting element such as a quantum-dot light
emitting diode (QLED) in each of the pixels of the display area
DP.
[0042] The invention is not limited to the embodiments described
above, but various modifications can he made. Various altered and
modified examples within the range of the idea of the invention
will occur to those skilled in the art, and it is understood that
the altered and modified examples also belong to the scope of the
invention. For example, when those skilled in the art appropriately
add or remove a component or change the design of a component in
the embodiments described above, or add or omit a process or change
the conditions of a process in the embodiments described above,
those are included in the scope of the invention as long as they
include the gist of the invention. While there have been described
what are at present considered to be certain embodiments of the
invention, it will be understood that various modifications may be
made thereto, and it is intended that the appended claims cover all
such modifications as fall within the true spirit and scope of the
invention.
* * * * *